Thymus Glands
《英文msh詞典》Thymus Glands
[入口詞] Thymus Glands
[主題詞] Thymus Gland
[英文釋義] A single,unpaired primary lymphoid organ situated in the MEDIASTINUM,extending superiorly into the neck to the lower edge of the THYROID GLAND and inferiorly to the fourth costal cartilage. It is necessary for normal development of immunologic function early in life. By puberty,it begins to involute and much of the tissue is replaced by fat.